Hi,
Can you help me figure out what the problem is using the modified example (I
provided in last response), a fast machine which has the tips and tricks
implemented?
I directly connected our 64 core / 4 GPU / >250GI RAM workstation with 10G
output directly to the X310 10G, which should easily keep up with 200Msps.
I ran the same program I provided above (I just modified your example program
tx_timed_samples.cpp) and now it outputs S’s instead of U’s.
Here is the output:
```
cjohnson@demo:~/uhd_versions/uhd_4.4.0.0/host/build/examples$ ./tx_timed_samples
Creating the usrp device with: type=x300,addr=192.168.30.2...
[INFO] [UHD] linux; GNU C++ version 11.4.0; Boost_107400;
UHD_4.4.0.HEAD-0-g5fac246b
[INFO] [X300] X300 initialization sequence...
[INFO] [X300] Maximum frame size: 8000 bytes.
[INFO] [GPS] Found an internal GPSDO: LC_XO, Firmware Rev 0.929a
[INFO] [X300] Radio 1x clock: 200 MHz
Using Device: Single USRP:
Device: X-Series Device
Mboard 0: X310
RX Channel: 0
RX DSP: 0
RX Dboard: A
RX Subdev: UBX RX
RX Channel: 1
RX DSP: 1
RX Dboard: B
RX Subdev: UBX RX
TX Channel: 0
TX DSP: 0
TX Dboard: A
TX Subdev: UBX TX
TX Channel: 1
TX DSP: 1
TX Dboard: B
TX Subdev: UBX TX
Setting TX Rate: 200.000000 Msps...
Actual TX Rate: 200.000000 Msps...
Setting device timestamp to 0...
[WARNING] [0/Radio#0] Attempting to set tick rate to 0. Skipping.
Send timeout...
Send timeout...
Send timeout...
Send timeout...
Send timeout...
Send timeout...
Send timeout...
SSSSSSSS (... more S's)
```
I verified the interface is setup for 9000 MTU, and that I have made the
adjustments indicated in
<https://kb.ettus.com/USRP_Host_Performance_Tuning_Tips_and_Tricks>\
except for Specture / bios changes). This includes Ring Buffers for NIC and
Network Buffers
```
(Below, same for CPU 0-63)
analyzing CPU 63:
driver: intel_cpufreq
CPUs which run at the same hardware frequency: 63
CPUs which need to have their frequency coordinated by software: 63
maximum transition latency: 20.0 us.
hardware limits: 800 MHz - 3.50 GHz
available cpufreq governors: conservative, ondemand, userspace, powersave,
performance, schedutil
current policy: frequency should be within 800 MHz and 3.50 GHz.
The governor "performance" may decide which speed to use
within this range.
current CPU frequency is 3.50 GHz.
```
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